Hi came across a lighting fault today and didn't have time to go into it deeply will be going back Monday. I wondered what you all thought or if you had come across anything similar. I used my kewtech tester to test a light after I had changed a faulty switch. It was showing 197 volts on my meter and would get a zs reading. I dropped the light down and found 238 on L - N, 180 on L - E, and 50 on N-E. This was also the case at other lights on this circuit. The other lighting circuit was fine and normal though, so were the sockets. Thanks for any input

Do a cpc continuity test with a wander lead when you go back and it will have come adrift somewhere.

You need something to measure the voltage against, so you got OK voltage between live and neutral because the neautral was effectively providing a good zero to measure the live against.

If the earth was good you would have got the same reading. As you are using a high input impedance tester you will still measure something even if the earth is disconnected or poorly connected. V=IR so the 180ish volts you measured is the product of a tiny current but very high input impedance of the meter. If you had used an old analog meter I think it would have registered zero volts.

i had one of these before Christmas. ive never seen so many junction boxes and chocolate boxes under a floor. i gave up after a couple of hours and rewired the ground floor lights in the end. fortunately no carpets with lots of floors already up by the plumbers. (they do have their uses. )

yeah, same outcome here - was a cpc that had come out of connector block.
What's worse is that it was the only damned fitting on that floor that I had installed: un-##**ing-believable!!
(I took down nearly every other fitting and pulled up treated floor boards.